MS Mailer is an add-on utility that utilizes System 7's drag and drop features to easily enclose documents within a message.

The MS Mailer is placed on the desktop or within any folder - when a user wants to send a document, they simply drag the enclosure and drop it on top of the mailer icon.  MS Mail will open a message box and automatically enclose the document.  The user simply needs to type their message and address it and click on send.